Recent progress towards a quantitative description of filamentary SOL transport

D. Carralero, M. Siccinio, M. Komm, S.A. Artene, F.A. D'Isa, J. Adamek, L. Aho-Mantila, G. Birkenmeier, M. Brix, G. Fuchert, M. Groth, T. Lunt, P. Manz, J. Madsen, S. Marsen, H.W. Müller, U. Stroth, H.J. Sun, N. Vianello, M. WischmeierE. Wolfrum

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Abstract

A summary of recent results on filamentary transport, mostly obtained with the ASDEX-Upgrade tokamak (AUG), is presented and discussed in an attempt to produce a coherent picture of scrape-off layer (SOL) filamentary transport. A clear correlation is found between L-mode density shoulder formation in the outer midplane and a transition between the sheath-limited and the inertial filamentary regimes. Divertor collisionality is found to be the parameter triggering the transition. A clear reduction of the ion temperature takes place in the far SOL after the transition, both for the background and the filaments. This coincides with a strong variation of the ion temperature distribution, which deviates from Gaussianity and becomes dominated by a strong peak below 5 eV. The filament transition mechanism triggered by a critical value of collisionality seems to be generally applicable to inter-ELM H-mode plasmas, although a secondary threshold related to deuterium fueling is observed. EMC3-EIRENE simulations of neutral dynamics show that an ionization front near the main chamber wall is formed after the shoulder formation. Finally, a clear increase of SOL opacity to neutrals is observed, associated with the shoulder formation. A common SOL transport framework is proposed to account for all these results, and their potential implications for future generation devices are discussed.
Original languageEnglish
Article number056044
Pages (from-to)-
JournalNuclear Fusion
Volume57
Issue number5
DOIs
Publication statusPublished - 11 Apr 2017
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Carralero, D., Siccinio, M., Komm, M., Artene, S. A., D'Isa, F. A., Adamek, J., Aho-Mantila, L., Birkenmeier, G., Brix, M., Fuchert, G., Groth, M., Lunt, T., Manz, P., Madsen, J., Marsen, S., Müller, H. W., Stroth, U., Sun, H. J., Vianello, N., ... Wolfrum, E. (2017). Recent progress towards a quantitative description of filamentary SOL transport. Nuclear Fusion, 57(5), -. [056044]. https://doi.org/10.1088/1741-4326/aa64b3